Centrifugal casting machine



Dec. 27, 1932.

A. VON FRANKENBERG CENTRIFUGAL CASTING MACHINE IN VENT OR Fzwzkmbezy,

ORNEYAS.

Dec. 27, 1932.

A. VON FRANKENBERG CENTRIFUGAL CASTING MACHINE Filed Sept. 11. 1930 3 Sheets-Sheet 2 w l m m M b 3 Dec. 27, 1932.

A. VON FRANKENBERG 1,892,440 CENTRIFUGAL CASTING MACHINE Filed Sept. -11, 1930 S Sheets-Sheet 3 N INVENTOR fllbredzl mll emkan hay,

Ill/5 'ATTORNE S Patented Dec. 27, 1932 UNITED STATES PATENT OFFICE -.ALBRECHT VON FRANKENBERG, 0F GEISENKIRCHEN, GERMANY, AS SIGNOB, BY

ASSIGNMENTS, TO DURAFER (INC), OF DOVER,

DELAWARE DELAWARE, A. CORPORATION OF CENTBIFUGAL CASTING i Application filed September 11, 1930. Serial No. 481,156.

v may be facilitated.

' The art of centrifugal casting has heretofore been extended to devices for casting pipes and the like upon a horizontal axis. In these existing forms of casting, machines cores have been used to form bell ends and I the like upon pipe sections, the cylindrical portion. of the pipe being formed without a core by the rapid rotation of the mold as distinguished from the previous casting methods. The present invention provides a device for .casting in a vertical axis, the device including a core for forming the inner surface of the casting, the core and mold being relatively movable axially to effect the removal of the casting therefrom.

In order to expedite the successive casting operations, the mold, in accordance with the present invention, is adapted to be cooled effectively by means of a cooling fluid which may be so controlled as to preserve a desired mold temperature uniformly during successive casting operations. Improved -means is further provided for mounting the rotatable mold and for imparting rotation thereto, the construction and coaction of the core withcthe mold being such that it may be readily removed to provide for theremoval of the castingfromthe machine.

-An object of the invention, accordingly, is to provide an improved molding machine by means of which the mold temperature may be efiectively controlled.

A further object of the invention isto provide a machine of the above character, where- 45 in cooling thereof is effected in accordance with desired conditions of operation.

A further object of the invention is to provide a mold of the above character, wherein successive pourings and castings may be readily efiected.

A further object of the invention is to provide a mold of the above character, the core whereof is readily removable to effect the removal of the casting.

A further object of the invention is to provide a mold of the above character, wherein rotation is imparted thereto through a simple and effective mechanism, at the same time preserving the accessibility and interchange-' ability of the core.

A further object of the invention is to provide a mold of the above character, wherein the same is effectively mounted for rotation,

means being provided to removably secure 5 the core thereto.

A further object of the invention is to provide a method for manufacturing a brake drum, such method comprising casting the same centrifugally in an improved fashion.

A further object ofthe invention is to provide an improved unitary cast brake drum.

Further objects, not specifically enumerated above, will be apparent as the invention is described in greater detail in connection with the accompany drawings, wherein:

Figure 1 is a view in vertical section, taken through the axis of a mold constructed in accordance with the present invention'and showing the cooling mechanism, rotating u mechanism and core supporting means, in addition to cooperating structure therefor.

Figure 2 is a segmental plan view showing the mold of Figure 1.

. Figure 3 is a v ew in section, similar to Figure 1, but showing a modified mold structure and cooling means therefor.

Figure 4 is a view in section, taken on line 4-4 of Figure 1, and looking in the direction of the arrows.

Figure 51s a view in section, taken on line 55 of Figure 4, and looking in the direction of the arrows.

Figure 6 is a segmental view in section, showing a brake drum constructed in accordance with the present invention.

lVith reference to the construction shown in Figures 1, 2, 4, and 5, a base or supporting element is shown at 1 as having flanges 2 by means of which the structure is secured to a I floor or other supporting surface. The base 109 weight ofthe mold structure is rotatably mounted upon the base and, in addition to the lands 4, lands 7 are formed on the base to mount horizontally adjustable rollers 8 for imparting lateral stability to the mold and preventing vibration thereof during rotation.

A bracket 9 is secured to the, side of the base 1 at a suitable height to mounta driving motor 10 which drives a shaft 11 to which a bevel gear 12 is secured. The shaft 11 ;is journaled at 13 in a suitable fitting carried by the base 1 and the mold structure is thus conveniently rotated by the foregoing mechanism which cooperates with driving mechanism formed on the rotatable mold.

A rotatable mold is shown at 14 having an outer wall 15 and a molding surface 16. The molding surface terminates in an upwardly extending funnel 17 through which a molten metal is poured in casting. The funnelprcferably has abushing 18 secured thereto and receives a stationary funnel portion 19 which is carried upon a horizontal frame'20. Vertical supporting members 21 mount the frame upon the base 1 as will be clearly ap parent from Figure 1. I

A mold cover 22 is secured to the outer wall of the mold by a series of bolts 23 and'is formed with an aperture 24 adiacent which an extension 25 is providedforming a sealing groove 26. Spaced abouf'the periphery of the outer wall 15 are a plurality of outlet pipes 27 which extend into an annular enclosed trough 28 formed with an annular groove 29 for receiving the outlet pipes. In this fashion. cooling fluid may be withdrawn from the chamber formed by the outer wall 15 and the molding surface 16 of the mold, the fluid being introduced through pipes 30 which are carried bv the frame members 21 andhave downwardly extending portions31 which arereceived within the aperture In the formshown herein the outer wall-15 and molding surface 16 are formed as separate units and mounted upon an annular base, 32 having a cylindrical portion 33 and an.

annular flange 34 upon which a rack 35 is secured. This rack is adapted to engage the gear 12 and thus transmits rotary motionto.

the mold. I

Extending through the cylindrical portion of the base are a plurality of removable -u'res 4 and 5, to facilitate manner outlined above.

'is adapted to cooperate with base 55, the rotation thereof he s 36 which are adapted to engage the outer.

that the core may be removed from the mold by removing the keys 36 and dropping the I formed with a dust' flange 38,. a cylindrical.

drum portion 39 and a disc or spider 40. When the mold is rotating at a sufficient speed, metal is introduced thereinto through the funnel 19 and the enormous force exerted manner which will be described-in own as of such characteras to upon the particles of metal by thecentrifugal action thereof serves to produce a brake drum, the metal of which is extremely dense and the characteristics of which are those enumerated hereinbefore. After the metal has been cast, the core and cast drum are.

removed by elevating a suitable table, indicated in dot and dash lines at 41, and removing the keys 36. The table is then dropped with the mold and casting and the latter removed through one of the openings 3. If desired, a conveyor 42 may be provided, as indicated in dot and dash lines lines in Figthe removal of the core and casting and a fresh core may be inserted through the other opening and secured 1n position a manner which'will be readily understood. It is desirable, of course, to provide notches in thev table 4 and to receive the ends of the keys 36 and thus permit'the table to elevated into direct contact with-the core 37. e l

The cooling of the mold is effected in the By regulating the flow of the cooling fluid through thievpipes 30, the temperature of the mold may be pre served at any desired value, the discharge of the fluid from the mold being effected as described above. It will be understood that the fluid may be carried away from the trough 28 in any desired fashion, this trough being mounted upon the stationary portionf-of the mold by means of suitable angle .irons 43.

From the foregoing, it will be seen that the casting operation whereby centrifugal castings. are formed is greatly simplified by-the construction described herein. Repeated castings may be made and the mold may function continuously with but a comparatively slight amount of manual sup'ervision. e specific form of the mold elements may be varied, if desired, 'amodified form being illustratedin Figure 3, wherein the outer wall 50 of the moldis formed with cylindrical flanges 51 and 52; The wall is mounted upon the stationary portion 530i the "frame and a molding surface 54 which is mountedupo'n a rotatable being effected in amanner similar to that described in connec- Ice tion with the device shown in Figure 1. The

neck 56 which is formed with a reentrant cylindrical flange 57, adapted to be received within the flange 51 and seal the same. A

funnel 58 is mounted uponthe stationary outer wall and extends within the neck 56 to serve as a sealing member for the top of the mold.

The rotatable molding surface is also formed with a reentrant cylindrical flange 59 which is adapted to cooperate with the flange 52 to seal the joint between the stationary and rotatable elements. A sealing member 60 is preferably inserted between the flanges to seal the joint effectively and the rotatable elements are thus adapted to cooperate effectively with the stationary elements ofthe mold to provide an eflicient molding device.

The cooling of the mold is effected by a liquid 61 which is provided within the chamber formed between the outer walland the molding surface 64. A coil 62 is providedwithin the chamber and communicates with inlet and outlet pipes 63, whereby the cooling medium 61 may be cooled at any desired rate thus preserving the temperature of the medium at a predetermined desired-value. It hasbeen found desirable to select a cooling medium having a high boiling point, the cooling thereof being efl'ected'at any desired rate by means of the coil 62 through which water is directed.

While the invention has been described with specific reference to the accompanying drawings, it is not to be limited, save as defined in the appended claims.

I claim as my invention: a

1. A casting'machine comprising a base, a mold, means to mount the mold on the base with a capacity for rotation about its vertical axis, a core, means on the mold to secure the core removably to the lower side thereof, means to lower the core with the casting away from the-mold, teeth'on the mold, and means on the base to engage the teeth and rotate the mold. I

2. A casting machine comprisinga base, a mold, means to mount the mold on the base with capacity for rotation about its vertical axis, a' core, means on the mold to secure'the core removably to the lower side thereof, means to lower the core with the casting away from the mold, a gear ring on the mold, a.

shaft journaled in the base, and a gear on the shaft to engage the gear ring.

3. A casting machine comprising abase, a

mold, means to mount the mold on the base- -with capacity for rotation about its vertical axis, a core, means on the mold to secure the core removably to the lower side thereof,

means to lower the core with the casting away from the mold, and means torotate the mold, the base being formed with an aperture through which access is provided to the core.

4. A casting machine comprising a base, a

facilitate removal thereof independently of the mold.

5. A casting machine comprising a base, a plurality of lands on the base, rollers j ournaled upon horizontal axes upon certain of means on the mold to secure the the lands, rollers journaledupon vertical axes upon other of the lands,- a mold, and tracks on the mold to engage the respective lands.

6. A casting machine comprising a base, a

plurality of lands on the base, rollers ,journaled upon horizontalaxes upon certainof' the lands, rollers journaled upon vertical axes upon other of-the lands, a mold, and a horizontal flange on the mold, said flange being formed with a horizontal and a cylindrical surface to engage the respective rollers.

7. A casting machine comprising a base, a mold mounted thereon rotatably,-a core disposed within the mold and concentric therewith, a chamber formed on the mold, outlet pipes extending from the periphery of'the chamber, an annular trough for receiving a cooling medium from the pipes, and means to lower the core away from the mold. v 8. A casting machine comprising a base, a

mold mounted thereon rotatably,' a core-dis= posed within the mold and concentric therewith, achamber formed on the mold, outlet pipes extending from the periphery of the I chamber, an annular trough for receiving a cooling medium from the pipes, m eans for supporting the trough upon the. base,and means to lower the core away from the mold.;

9. A casting machine comprising a base a mold mounted thereon rotatably, a jacket or the mold forming a chamber about the mold I for receiving a cooling fluid, said jacket having a horizontal portion formed with an -aperture, a spout on the mold extending upwardly axially thereof, and .means to introduce a cooling medium into the jacket through the aperture.

10.. -A casting machine comprising a base,-

a mold mounted thereon rotatably,- a jacket for the mold forming a chamber about'the mold for receiving a COOllIlgflllld, a support ing ring mounting the jacket and mold, and v i 12 means to rotate therlng.

11. A casting machine comprising a base,

a'mold mounted thereon rotatably, a jacket for the mold forming a chamber about the mold for receiving a cooling fluid, a supporting ring mounting the jacket and mold, a

horizontal flange on the ring; means associated'with the ring for mounting a core, and

means to rotate the flanges.

12. A casting machine comprising a base, a

mold mounted thereon rotatably, a acket for the mold forming a chamber'about the mold for receiving a cooling fluid, a supporting ring mountingthe {jacket and mold, a horizontal flange on t e ring, keys mounted 5 radially on the ring for mounting a core, and an annular rack on the horizontal flange.

This specification signed this 27th day of May, A. D. 1930. x v

ALBRECHT v. FRAN KEN BERG. 

